Gold Nugget
Native Gold (Au)
mineral
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
Pink Dyed Agate
Chalcedony (SiO2) with artificial dyes
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Citrine variety)
Silicon Dioxide (SiO2)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Carnelian
Carnelian (Silicon Dioxide - SiO2)
mineral
Schorl (Black Tourmaline)
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Dzi Bead (Agate)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Schorl (Black Tourmaline)
NaFe3Al6(BO3)3Si6O18(OH)4 (Complex Borosilicate)
mineral
Gold
Native Gold (Au)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Serpentinite (Serpentine Rock)
Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.
Metamorphic Rock
Quartz-veined Sedimentary Rock
Hydrothermally veined Clastic Sedimentary Rock (SiO2 veins in Matrix)
sedimentary
Granite featuring Quartz Vein
Granite with hydrothermal silica (SiO2) intrusion
igneous
Petrified Wood (Silicified Wood)
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
mineral
Aura Quartz (Pink/Rose Aura Quartz)
Silicon Dioxide (SiO2) bonded with Platinum and/or Silver
mineral
Beads (likely glass or man-made material)
N/A (artificial material)
Man-made material, not a natural rock or mineral specimen
Serpentinite
Serpentinite (a rock composed predominantly of serpentine group minerals)
metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
Mineral in Metamorphic/Igneous Host
Sphalerite in Matrix (Polished Point)
Zinc sulfide (Zn,Fe)S
mineral
Mica Schist
Mica Schist (contains Muscovite/Biotite, Quartz)
metamorphic
Quartz (Milky/Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Red Jasper
Jasper (a variety of Chalcedony, SiO₂)
Mineraloid (cryptocrystalline quartz)
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, e.g., Antigorite, Lizardite, Chrysotile)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Quartz (Engineered Quartz Surface)
Silicon Dioxide (SiO2) based composite
mineral (man-made composite)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Blue Quartzite (Aventurine)
Quartzite (primarily SiO2) with inclusions of Dumortierite or Magnesio-riebeckite
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Gneiss
Gneiss (pronounced 'nice')
Metamorphic Rock
Brachiopod Fossil in Limestone
Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)
sedimentary
Greenschist
Greenschist (chlorite-epidote schist)
metamorphic
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (with Goethite/Limonite cement)
sedimentary
Tiger's Eye (Golden)
Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold) Cube
Iron Sulfide (FeS2)
mineral
Serpentine Schist with Quartz Vein
Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).
Metamorphic
Shale
Shale (Lutite)
sedimentary
Amazonite
K(AlSi3O8) - Potassium Feldspar (Microcline variant)
mineral